No doubt there is a conflict among scholars on this issue whether it should be taken or not. I respect both the scholars with different views. Its a vast issue but here , i will give some valid reasons why i consider aahad hadeeth should be accepted.
These are the arguments for acceptability of aahad hadith.
1) Allah says in Quran “It is not for a believing man or believing women, when Allah and his messengers have decided a matter, that they should have any choice about their affairs” Surah 33 ayat 36.
In this verse “when Allah and his messengers have decided a matter” means everything, without exception, aahad or mutawaatir (continuously recurrent) .
2) Allah says in Quran “O you who believe! If a rebellious evil person comes to you with a news verify it” Surah 49 ayat 6.
I think this is a clear evidence for the acceptance of aahad hadeeth. The Quranic verse implies that “If a rebellious evil person” brought a report then the news should be taken after verifying it. So my question is why we should not accept the news of pious person who narrated a “aahad hadith”.
3) Allah’s says in Quran “Out of every batch, a group of individual should remain behind, that they may get instruction in religion, and warn their people when they return to them, so that they may beware”.(Surah 9 ayat 122)
According to Imam Bukhari a single man may be referred to as a group (taa’ifah) because Allah said: “And if two groups among the believer fight, reconcile between them…” (Surah 49 ayat 9).
So it is clearly proved from above ayats that aahad reports should be accepted.
4) Below are the authentic hadeeths which make the issue more crystal clear.
We came to the Prophet and stayed with him for twenty days and nights. We were all young and of about the same age. The Prophet was very kind and merciful. When he realized our longing for our families, he asked about our homes and the people whom we left behind and we told him about them. Then he asked us to go back to our families and stay with them and teach them (the religion) and to order them to do good things. (Sahih Bukhari, Book #1.Hadith #604)
Anas reported that the people of Yemen came to Allah’s Messenger (may peace be upon him) and said: Send with us a person who should teach us Sunnah and al-Islam, whereupon he (the Holy Prophet) caught hold of the hand of Ubaida and said: He is a man of trust of this Umma. (Sahi Muslim.Book #31, Hadith #5948)
If aahad reports are not accepted with certainty, then the prophet would not have sent his companions for the purpose of teaching.
Indeed Allah knows the best…